Pu.D. Associate Professor of Physics at the end of 1925 compared with their endoskeletal supports. Orders Archistia, Selachostomt, Belonorhynchit, Cladtstia, Sub-class 2. ANOMODONTIA. Orders Pelycosauria, Therapsida. Sub-class 3. Crossopterygit.Scales, when ganoid, with a